
#screen {
    width: 400px;
    height: 250px;
    font-size: 23px;
    background-color: #A5977C;
    color: white;
    border-radius: 10px;

    text-align: center;
    line-height: 70px;/*两行文本，line-height 不能等于 height*/
}

#match-button {
    width: 400px;
    height: 50px;
    font-size: 20px;
    color: white;
    background-color: orange;
    border: none;
    outline: none;
    border-radius: 10px;

    text-align: center;
    line-height: 50px;

    /*向上有个 20像素的间距*/
    margin-top: 20px;
}


/*当按下按钮时，背景颜色改变*/
#match-button:active {
    background-color: #A4977B;
}

